Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F4/00—Polymerisation catalysts
  • C08F4/02—Carriers therefor
  • C08F4/022—Magnesium halide as support anhydrous or hydrated or complexed by means of a Lewis base for Ziegler-type catalysts
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F10/00—Homopolymers and copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond

Definitions

• alkyl metal compound of Groups I-III in combination with a transition metal compound of Groups IVA-VIII as a catalyst system for clefinic polymerization. While nearly all of the alkyl metal compounds are effective for the polymerization of ethylene, only a few are effective for the preparation of isotactic polymers of propylene and higher alpha-olefins and only Et 2 AlCl, AlEt 3 and i-Bu 2 AlH have any important commercial utility.
• a major cost involved in the polymerization of the alpha-olefins is the cost of the catalyst components. Therefore, the cost of the manufacture of the polymer can be effectively reduced by the use of catalyst systems having a higher polymerization activity.
• a further concern is the ability to produce polymers having a minimum amount of catalyst residues theraby eliminating a costly deashing operation.
• a still further concern is the ability to produce polymers having a high degree of isotactic stereoregularity thereby enabling the manufacturer to eliminate or reduce the costly operation involving the removal and separation of atactic polymer from the isotactic polymer.
• the improved catalyst system of the present invention provides a means to the manufacturer of obtaining these desirable realizations.
• the improved catalyst systems of the present invention which are employed in alpha-olefin polymerizations.include a Group IVA-VIII transition metal chloride or bromide, one or more Lewis bases and as a Co-catalyst at least one metal alkyl compound having at least one group wherein R" is a methyl or ethyl group, and R''' is a C to C 10 alkyl group, more preferably a C 1 to C 6 alkyl group and most preferably a C 1 to C 3 alkyl group.
• the transition metal catalyst compound is a Group IVA-VIII transition metal chloride or bromide and the transition metal halide may be in the form of solid crystalline compounds, solid solutions or compositions with other metal salts. It can be supported on the surface of a wide range of solid supports. For highest sterospecificity it is desirable to have the transition metal halide, or its support composition, in the layer lattice structure with very small crystallites, high surface area, or sufficient defects or foreign components to facilitate high dispersion during polymerization.
• the transition metal halide may also contain various additives such as Lewis bases, pi bases, polymers or organic or inorganic modifiers.
• Vanadium and titanium halides such as VC1 3 , VBr 3 , TiCl 3 , TiCl 4 , TiBr 3 or TiBr 4 are preferred, most preferably TiCl3 or TiCl 4 and mixtures thereof.
• the most preferred TiCl 3 compounds are those which contain TiCl 4 edge sites on a layer lattice support such as alpha; delta, or gamma TiCl 3 or various structures and modifications of TiCl 3 , MgCl 2 or other inorganic compounds having similar layer lattice structures.
• the most preferred TiCl 4 compounds are those supported on chloride layer lattice compounds such as MgCl 2 .
• chloride As an alternative to chloride other anions may also be present, such as other halides, pseudo-halides, alkoxides, hydroxides, oxides or carboxylates, etc., providing that sufficient chloride is available for isospecific site formation.
• Mixed salts or double salts such as K 2 TiCl 6 or MgTiCl 6 can be employed alone or in combination with electron donor compounds.
• Other supports besides MgCl 2 which are useful are hydroxychlorides, oxides or other inorganic or organic supports.
• the most preferred transition metal compound is TiCl 4 containing MgCl 2 especially in the presence of Lewis bases (electron donor compounds).
• the Lewis bases are employed in combination with the trialkyl metal compound or with the Group IVA-VIII transition metal halide or with both components as long ; as they do not cause excessive cleavage of metal-carbon bonds or loss of active sites.
• a wide variety of Lewis bases may be used including such types as tertiary amines, esters, phosphines, phesphine oxides, phosphates (alkyl, aryl), phosphites, hexaalkyl phosphoric triamides, dimethyl sulfoxide, dimethyl formamide, secondary amines, ethers, epoxides, ketones, saturated and unsaturated heterocycles, or cyclic ethers and mixtures thereof.
• Typical but non-limiting examples are diethyl ether, dibutyl ether, tetrahydrofuran, ethyl acetate, methyl p-toluate, ethyl p-anisate, ethyl benzoate, phenyl acetate, amyl acetate, methyl octanoate, acetophenone, benzophenone, triethyl amine, tributylamine, dimethyl decylamine, pyridine, N-methylpiperidine, 2,2,6,6 tetramethylpiperidine and the like.
• esters of carboxylic acids such as ethylbenzoate.
• R is preferably a neopentyl group.
• R' is C 2 -C 10 primary alkyl or aralkyl group or hydrogen; most preferably, R' is C Z -C 4 primary alkyl or hydrogen with the restriction that not more than one hydrogen may be present.
• the R group is most preferably one which is not readily susceptible to elimination or displacement by monomer during polymerization.
• other groups are also effective, in which the aluminium is attached to a secondary or tertiary carbon atoms, i.e., cyclohexyl, cyclooctyl, tert-butyl, tert-amyl, s-norbornyl and the like.
• Suitable non-limiting examples include i-Pr 2 AlEt, s-BuAlEt 2 , s-Bu 2 AlEt, t-BuAlEt 2 , t-Bu 2 AlEt, s-Bu 3 Al, 1,1-dimethylheptyl AlEt 2 , s-Bu 2 Aln-C 16 H 33 , neopentyl 2 AlEt, neopentyl AlEt 2 , t-Bu 2 AlCH 2 C 6 H 5 , (2,2-dimethylphenyl) 2 AlEt, s-Bu(t-Bu)Aln-Bu, cyclohexyl 2 AlEt, s-pentyl Ali-Bu 2 , t-Bu 2 AlMe, t-Bu 2 Aln-C 8 H 17 , (2-ethylcyclopentyl) 2 AlEt, 2-(3-ethylnorbomyl)AlEt 2 , 2-norborn
• Preferred compounds include those in the above list which have the formula R 1-2 AlR' 2-1 .
• the most preferred compounds in the above list have the formula R 2 AlR'.
• One method of preparing these secondary alkyl aluminum compounds is to react internal olefins with AliBu 3 or i-Bu 2 AlH to add Al-H across the double bond to form sec- strained ring compound, AlR 3 may be used to add Al-R across the double bond and obtain preferred compounds which are very resistant to displacement or elimination.
• Strained ring olefins include cyclopentene, norbornene, norbornadiene, ethylidine norbornene, dicyclopentadiene, and the like. This method is preferred because of raw material availability and simplicity of reaction, although this invention is not limited by the method of synthesis.
• Heopentyl aluminum compounds may be made by adding AlMe 3 to isobutylene.
• Other methods include the direct synthesis from the reactive metals and the secondary or tertiary halides, the various organometallic syntheses involving ligand exchange between Al, Ga or In compounds and secondary or tertiary alkyl metal compounds of more electropositive metals such as Group IA and IIA, and the reaction of the metals with the alkyl mercury compounds.
• Particularly useful is the general reaction of secondary or tertiary alkyl lithium compounds or neopentyl lithium with R'MX 2 or R' 2 MX because it takes place readily in dilute hydrocarbon solutions.
• di-secondary alkyl aluminum compounds are preferred to mono-secondary alkyl compounds, the monoalkyl types become more effective the greater the steric bulk of the group as long as it does not interfere with active site formation or lead to decomposition under reaction conditions.
• the most preferred transition metal compounds contain TiC1 4 supported on MgCl 2 and one or more Lewis bases.
• the concentration of the transition metal in the polymerization zone is 0.001 to 5mM, preferably less than 0.1mM.
• the molar ratio of the alkyl metal compound to the transition metal compound is preferably 0.5:1 to 50:1, more preferably 1:1 to 20:1, most preferably 5:1.
• The. molar ratio of Lewis base to organometal compound can vary widely but is preferably 0.1:1 to 1:1.
• the catalyst system of the invention enables the process for making alpha olefin polymers having a high degree of isotactic stereoregularity to be carried out at a temperature of 25° to 150°C., more preferably 40° to 80°C., at pressures of 1 atm. to 50 atm.
• the reaction time for polymerization is 0.1 to 10 hours, more preferably 0.5 to 3 hours. Due to the high catalyst activity, shorter times and temperatures below 80°C. can be readily employed.
• the reaction solvent for the system can be any inert paraffinic, naphthenic or aromatic hydrocarbon such as benzene, tcluene, xylene, propane, butane, pentane, hexane, heptane, cyclohexane, and mixtures thereof.
• excess liquid monomer is used as solvent.
• Gas phase polymerizations may also be carried out with or without minor amounts of solvent.
• C 2 -C 20 alpha-olefinic monomers employed in the present invention for the manufacture of homo-, co- and terpolymers are ethylene, propylene, butene-1, pentene-1, hexene-1, octadecene-1, 3-methylbutene-l, styrene, ethylidene norbornene, 1,5-hexadiene and the like and mixtures thereof.
• Isotactic polymerization of propylene and higher olefins is especially preferred, including block copolymerizations with ethylene.
• the alkyl metal compound and the supported transition metal compound can be added separately to the reactor or premixed before addition to the reactor, but are preferably added separately. Replacing the secoudary or tertiary alkyl groups by bulky or hindered alkoxy, phenoxy or dialkylamide groups does not provide the improved catalyst activity achieved by the cocatalyst in this invention.
• An alternative embodiment of the present invention with respect to the cocatalysts is to use directly the reaction product of R 2 Mg+R'MX 2 ⁇ R 2 MR' + MgX 2 as exemplified in Belgian patent 863827; or RMgX'+ R' 2 MX ⁇ RMR' 2 +MgXX' as exemplified in Belgian patent 863823.
• the metal di- or trihalide compounds which are used are R'MX 2 , MX 3 or a mixture thereof, wherein M is Al, Ga or In, R' is a C 1 to C 20 primary alkyl, alkenyl or aralkyl group or hydride; X is chloride, bromide or a monovalent anion which cannot initiate polymerization of olefinic monomers, wherein the anion is alkoxide, phenoxide, thialkoxide, carboxylate, etc. or a mixture thereof.
• Typical but non-limiting examples are ethyl aluminium dichloride, aluminum trichloride, ethyl aluminum dibromide, ethyl chloroalumnum bromide, octyl aluminum dichloride, ethyl indium dichloride, butyl aluminum dichloride, benzyl aluminum dichloride, ethyl chloroaluminum butoxide, and mixtures thereof. Mixtures of metal halide compounds can be readily employed.
• the C 2 -C 4 alkyl aluminum dihalides are most preferred for high stereospecificity and the monoalkylaluminum dichlorides are most preferred.
• the diorganomagnesium compound has the general formula R 2 Mg wherein R can be the same or different and may be C 3 to C 20 secondary or tertiary alkyl, cycloalkyl, aralkyl or alkenyl groups, or a group, wherein R" is an ethyl or methyl group and R"' is a C 1 to C 10 alkyl group.
• R can be the same or different and may be C 3 to C 20 secondary or tertiary alkyl, cycloalkyl, aralkyl or alkenyl groups, or a group, wherein R" is an ethyl or methyl group and R"' is a C 1 to C 10 alkyl group.
• Typical, but non-limiting examples are (s-Bu) 2 Mg, (t-Bu) 2 Mg or (iPr) 2 Mg.
• Mixtures of diorganomagnesium compounds can be readily employed providing at least one secondary, tertiary, or group is present
• the molar ratio of the alkyl metal halide compound (R'MX 2 ) to the diorganomagnesium compound is critical and is 0.5:1 to 2:1, more preferably 0.7:1, and most preferably 1:1.
• the ratio is 1:1 to 1:3, most preferably 2:3.
• the number of moles of Lewis base can vary widely but is preferably equal to or less than the sum of the moles of the metal halide compound and the diorganomagnesium compound.
• the molar ratio of the metal halide compound or the diorganomagnesium compound to the transition metal compound is less than 50:1 and more preferably less than 20:1.
• the metal halide compound and diorganomagnesium compound can be added separately to the reactor containing the transition metal compound but are preferably premixed before addition to the reactor. Employing either the metal halide compound or the diorganomagnesium compound alone with the transition metal compound does not provide the improved catalyst efficiency and stereospecificity as envisioned in this application. In order to attain this, it is necessary to employ both the metal halide compound and diorganomagnesium compound in combination with the transition metal compound in the critical proportions as previously defined.
• the concentration of the transition metal based on moles of metal halide or bromide and diorgano magnesium compound in the pol y meri- action zone is 0.001 to 5mM, preferably less than 0.1mM.
• the metal alkyl compounds which are used may be R' 2 MX, R' 3 M or a mixture thereof, wherein M is Al, Ga or In, R' is C 1 to C 20 primary alkyl, alkenyl, aralkyl or hydride
• X is a monovalent anion which cannot initiate polymerization of olfeins, such as F, Cl, Br, OR", SR", and OOCR", wherein R" is a C 1 to C 20 alkyl, branched alkyl, cycloalkyl, aryl, naphthenic, aralkyl or alkenyl group , X is more preferably Cl or Br and most preferably Cl.
• Typical but non-limiting examples are diethyl aluminum chloride, aluminum triethyl, diethyl-aluminum bromide, diethylaluminum iodide, diethylaluminum benzoate, diisobutylaluminum hydride, dioctylaluminum chloride, diethyl gallium butoxide, diethylindium neodecanoate, tri- ethylindium, dibenzylaluminum chloride and mixtures thereof.
• Mixtures of metal alkyl compounds can be readily employed.
• the C 2 -C 4 alkyl aluminum compounds are preferred for high stereospecificity, and the dialkyl aluminum chlorides are most preferred.
• the mono-organomagnesium compound has the general formula RMgX' wherein R is a C 3 to C 20 secondary or tertiary alkyl, cycloalkyl, aralkyl or alkenyl group or a groups, wherein R" is a methyl or ethyl group and R"' is a C 1 to C 10 alkyl group.
• X' is an anion which cannot initiate polymerization of olefins, such as Cl, Br, OR", SR" and OOCR", wherein R" is a C 1 to C 20 alkyl, branched alkyl, cycloalkyl, naphthenic, aryl, aralkyl, allyl or alkenyl group .
• Typical but non-limiting examples are s-BuMgCl, t-BuMgCl, s-BulMgOOCC 6 H 5 , or s-BuMgOC 15 H 31 , and mixtures thereof. Mixtures of organo- magnesium compounds can be readily employed.
• the most preferred x 1 groups are OR" and OOCR" and the most preferred R groups are secondary or tertiary alkyls.
• the molar ratio of the organomagnesium RMgX' compound to the metal alkyl compound is 2:1 to 1:2, most preferably 1:1.
• the number of moles of Lewis base can vary widely but is preferably equal to or less than the sum of the moles of the metal alkyl compound and the organomagnesium compound.
• the molar ratio of the metal alkyl compound or the organomagnesium compound to the transition metal compound is less than 20:1 and more preferably less than 10:1.
• the metal alkyl compound (R' 2 MX or R' 3 M) and organomagnesium compound RMgX' can be added separately to the reactor containing the transition metal compound but are preferably premixed before addition to the reactor.
• Employing either the metal alkyl compound or the organo- magnesium compound alone with the transition metal compound does not provide the improved catalyst efficiency and stereospecificity as envisioned in this application.
• the concentration of the transition metal based on rules of metal alkyl compound and organomagnesium compound in the polymerization zone is 0.001 to about 5mM, preferably less than O.lmM.
• An aluminum alkyl compound containing both sec-butyl and ethyl groups was prepared by mixing ' equimolar amounts of (sec-butyl) 2 Mg ⁇ 0.16 Et 2 O and ethyl aluminum dichloride in heptane, heating to 65°C., 15 min., separating the magnesium chloride solids and vacuum stripping the clear solution. NMR analysis indicated the composition as sBu 2 AlEt ⁇ 0.45Et 2 O. Metals analysis showed that only 0.50% Mg was present in this fraction.
• the above liquid alkyl aluminum compound (0.2 g) was used as cocatalyst with 0.2 g catalyst prepared by reacting anhydrous MgCl 2 (5 moles) with TiCl 4 ⁇ C 6 H 5 COOEt (1 mole) in a ball mill 4 days, followed by a neat TiCl 4 treat at 80°C., 2 hours, washed with heptane and vacuum dried.
• the catalyst contained 2.68% Ti.
• alkyl aluminum compounds containing sec-butyl groups were prepared by reacting the proper stoichiometric amounts of sec-butyllithium in heptane with either ethyl aluminum dichloride or diethyl aluminum chloride, heating to boiling, filtering the insoluble LiCl, and vacuum stripping the clear solutions. Nearly theoretical yields were obtained of s-BuEtAlCl (A), s-Bu 2 EtAl (B) and s-BuEt 2 Al (C). Compositions were established by 1 H and 13 C NMR and by G.C. analysis of the alkyl fragments.
• Sec-pentyl aluminum diisobutyl was prepared by reacting 19.57 g i-Bu 2 AlH with 75 ml pentene-2 in a glass lined 300 cc bomb at 135-140°C. for 16 hours, then 150°C. for 7 hours. The solution was vacuum stripped at 25°C., yielding 28.1 g of the neat sec-pentyl aluminum compound.
• the alkyl metal cocatalysts of the invention are particularly advantageous in having a much smaller effect of concentration (or alkyl metal/Ti) on stereospecificity, thereby simplifying plant operation and permitting better control of product quality.
• concentration or alkyl metal/Ti
• Table II for di - sec-butyl aluminum ethyl in contrast to AlEt 3 using the propylene polymerization procedure of Example 2.
• trialkyl aluminum compounds containing at least one secondary alkyl group are superior cocatalysts in Ziegler-type polymerizations of alpha-olefins and that di-secondary alkyl aluminum compounds are preferred.
• See-alkyl aluminum hydrides also give improved results compared to the closely related primary alkyl aluminum hydride (i-Bu 2 AlH), following the procedure of Example 2.
• i-Bu 2 AlH closely related primary alkyl aluminum hydride
• Another catalyst preparation was used. It was made by ball milling 5 moles MgCl 2 with 1 mole ethylbenzoate for one day, adding 1 mole TiCl 4 and milling 3 days, then treating with neat TiCl 4 at 80°C., 2 hours, washing with heptane and vacuum dried. The catalyst contained 3.44% Ti.
• Run 0 using sec-butyl groups gave higher activity and stereospecificity than Run N using the closely related, but primary, isobutyl groups. Improved results are also seen versus the AlEt 3 control using the same supported titanium catalyst (Example 2, Run C).
• Runs R and S show substantially higher heptane insolubles using two different sec-butyl aluminum hydrides compared to control Runs P and Q using AlEt 3 and iBu 3 Al with the same catalyst.
• Example 2 The procedure of Example 2 was followed except that various Lewis bases were mixed with the aluminum alkyl solution before charging to the reactor.
• Polymerization started when the TiCl 3 was rinsed into the reactor with 25 ml n-heptane from a syringe. Propylene feed rate was adjusted to maintain an exit gas rate of 200-500 cc/min at a pressure of 765 mm. After one hour at temperature and pressure, the reactor slurry was poured into one liter isopropyl alcohol, stirred 2-4 hours, filtered, washed with alcohol and vacuum dried.
• the TiCl3 was prepared by reduction of TiCl 4 with Et 2 AlCl followed by treatment with diisopentyl ether and TiCl 4 under controlled conditions, yielding a high surface area delta TiCl 3 having low aluminum content.
• a titanium catalyst containing MgCl 2 was prepared by dry ball milling 4 days a mixture of anhydrous MgCl 2 (1 mole), TiCl 4 (1 mole) and ⁇ -TiCl 3 (0.1 mole). Propylene was polymerized using the conditions in Example 11, Run B and the quantities shown in Table VIII. Activity with the cocatalysts of this invention (Run L) was intermediate between those of the AlEt 3 and AlEt 2 Cl controls (Runs J and K), but the stereospecificity as shown by % HI was much higher than the controls. The large increase in % HI obtained with this MgCl 2 - containing catalyst is in contrast to the results in Example 1 using TiCl 3 catalysts in which activity increased sharply but % HI decreased.
• a titanium catalyst was prepared by dry ball milling 4 days a mixture of 5 MgCl 2 , 1 TiCl 4 and 1 ethyl benzoate, heating a slurry of the solids in neat TiCl 4 2 hours at 80°C, washing with n-heptane and vacuum drying.
• the catalyst contained 3.78% Ti.
• Example 13 The procedure of Example 13 was followed using 0.2 g of the supported TiCl 4 catalyst together with (s-Bu) 2 Mg and variations aluminum compounds.
• Example 13 The procedure of Example 13, Run T was followed except that Lewis bases were also added to the AlEtCl 2 -(s-Bu) 2 Mg cocatalysts.
• Example 13 The procedure of Example 13, Run T was followed except that xylene diluent was used for polymerization instead of n-heptane. Activity was 676 g/g Cat/hr and the polymer gave 90.9% heptane insolubles. The polymer was precipitated with 1 liter isopropyl alcohol, filtered, dried and analyzed for metals. Found 13 ppm Ti and 83 ppm Mg. Thus at high monomer concentration and longer polymerization times the high efficiency would yield very low catalyst residues without deashing.
• Example 13 Run T was followed except that polymerization was carried out at 50°C and 80°C . Both polymerization rate and % HI decreased with increasing temperature, with the largest decrease taking place above 65°C (Table XI).
• Example 13 Run T was followed except that the catalyst of Example 18 was used and 1 mmole di-n-hexyl magnesium was used instead of 0.83 mmole (s-Bu) 2 Mg.
• the (n-hexyl) 2 Mg in Soltrol No. 10 was obtained from Ethyl Corporation (Lot No. BR-516). Polymerization rate was 551 g/g Cat/hr but the polymer gave 76.9% HI which is unexceptable.
• n-alkyl magnesium compounds do not yield the high stereospecificty of the secondary and tertiary alkyl compounds of this invention.
• a catalyst was prepared by dry ball milling 1 day a mixture of 5 MgCl 2 and 1 ethylbenzoate, adding 1 TiCl 4 and milling an additional 3 days, then treating the solids with neat TiCl 4 2 hours at 80°C, washing with n-heptane and vacuum drying (3.44 % Ti).
• Catalyst A was made with 1 MgCl 2 + 1 TiCl 4 -ethylbenzoate and B (2.10% Ti) was made with 10 MgCl 2 + 1 TiCl 4 -ethylbenzoate complex.
• Propylene was polymerized following the procedure of Example 13, Run T (Table XIII).
• a titanium catalyst supported on MgCl 2 was prepared by combining 5 MgCl 2 , 1 TiCl 4 and 1 ethylbenzoate, dry ball milling 4 days, heating a slurry of the solids in neat: TiCl 4 2 hours at 80°C; washing with n-heptane and vacuum drying.
• the catalyst contained 3.78% Ti. Portions of this catalyst preparation were used in the experiments shown in Table XIV. Various control runs are shown for comparison with the cocatalysts of this invention (Runs A-F).
• the sec-butyl magnesium was obtained from Orgmet and contained 72% non-volatile material in excess of the s-Bu 2 Mg determined by titration. IR, NMR. and GC analyses showed the presence of butoxide groups and 0.07 mole diethyl ether per s-Bu 2 Mg.
• the various s-BuMgX compounds were prepared directly by reacting an equimolar amount of ROH, RSH, RCCOH, etc. with the s-Bu 2 Mg.
• a second catalyst preparation 2.68% Ti was made following the procedure of Example 24 except that a preformed 1:1 complex of TiCl 4 ⁇ OCOOEt was used.
• the s-BuMgCl ⁇ Et 2 O was obtained by vacuum stripping an ether solution of the Grignard reagent.
• the n + s BuMgOOC 6 H 5 was made by reacting pure (n + s Bu) 2 Mg with benzoic acid. Propylene polymerizations were carried out as in Example 24 (Table XV).
• Run G shows that monoalkyl aluminum compounds are not effective in combination with the mono-organo- magnesium compounds in this invention.
• Example 13 Run T shows that such monoalkyl aluminum compounds are preferred when diorganolmagnesium compounds are used.
• Runs H and I show that dialkyl and trialkyl aluminum compounds are required with conoalkyl magnesium compounds.
• propylenc was polymerized at 690 kPa pressure in a 1 liter stirred autoclave at 50°C. for 1 hour using the supported TiCl 4 catalyst of Example 25 (Table XV).
• the Mg compound was made as in Example 24, Run A.
• Example 25 The procedure of Example 25 was followed except that organo-magnesium compounds containing alkoxy and benzoate groups were used in combination with AlEt 2 Cl together with diethyl ether.
• the s-BuMgOsBu was prepared by reacting a dilute solution of sBu 2 Mg containing 0.33 Et 2 0 with one mole s-BuOH and used without isolation (Run M).
• the mixture in Run N was prepared in a similar manner by reacting 1.55 mmole n + s Bu 2 Mg with 1.10 s-butanol, adding 0.066 Et 2 O, then adding this product to a solution of 1 benzoic acid in 275 ml n-heptane.
• Run H shows that superior results were obtained with smaller amounts of diethyl ether by using alkoxide and carboxylate salts instead of the chloride.
• Example 7 The procedure of Example 7, Run Z was followed except that 0.25 mmole Mg(OOCC 6 H 5 ) 2 was used in place of acetophenone as the third component.
• the magnesium benzoate was prepared from a dilute heptane solution of benzoic acid and n + s Bu 2 Mg.
• the t-Bu 2 AlEt was added to the milky slurry of mg(OOCC 6 H 5 ) 2 , charged to the reactor and heated to 65°C, 5 min., after which the supported titanium catalyst was added.

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• 1979
  • 1979-02-21 CA CA000322027A patent/CA1142161A/fr not_active Expired
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